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From: Sasha Levin <>
Cc: Florian Westphal <>,
	Tetsuo Handa <>,
	Pablo Neira Ayuso <>,
	Sasha Levin <>,,,,
Subject: [PATCH AUTOSEL 4.9 137/251] netfilter: ebtables: CONFIG_COMPAT: reject trailing data after last rule
Date: Thu, 16 Jan 2020 12:34:46 -0500
Message-ID: <> (raw)
In-Reply-To: <>

From: Florian Westphal <>

[ Upstream commit 680f6af5337c98d116e4f127cea7845339dba8da ]

If userspace provides a rule blob with trailing data after last target,
we trigger a splat, then convert ruleset to 64bit format (with trailing
data), then pass that to do_replace_finish() which then returns -EINVAL.

Erroring out right away avoids the splat plus unneeded translation and
error unwind.

Fixes: 81e675c227ec ("netfilter: ebtables: add CONFIG_COMPAT support")
Reported-by: Tetsuo Handa <>
Signed-off-by: Florian Westphal <>
Signed-off-by: Pablo Neira Ayuso <>
Signed-off-by: Sasha Levin <>
 net/bridge/netfilter/ebtables.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 56b7197f0373..1d850edecd72 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -2182,7 +2182,9 @@ static int compat_copy_entries(unsigned char *data, unsigned int size_user,
 	if (ret < 0)
 		return ret;
-	WARN_ON(size_remaining);
+	if (size_remaining)
+		return -EINVAL;
 	return state->buf_kern_offset;

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